Heat sealer



FIG. 1 is a front view of a heat sealer of my new design.

FIG. 2 is a rear view thereof.

FIG. 3 is a top view thereof.

FIG. 4 is a bottom vew thereof.

FIG. 5 is a left side view thereof; and,

FIG. 6 is a right side view thereof. 

The ornamental design for a heat sealer, as shown and described. 